hef4894b NXP Semiconductors, hef4894b Datasheet - Page 3

• Manufacturer Part Number: hef4894b
• Description: 12-stage Shift-and-store Register Led Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
January 1995
12-stage shift-and-store register LED driver
Fig.4 One D-latch.
FUNCTION TABLE
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
4.
5.
6. Z = high impedance OFF state
7. nc = no change
8. O
At the positive clock edge the information in the 10
transferred to the 11
CP
11
= positive-going transition
= negative-going transition
’ = the information in the twelfth shift register stage.
Fig.3 Logic diagram.
EO
H
H
H
H
L
L
INPUTS
3
th
STR
H
H
H
register stage and the O
X
X
L
D
H
H
X
X
X
L
O
nc
nc
PARALLEL
Z
Z
Z
L
OUTPUTS
0
s
output.
O
O
th
O
n
n
nc
nc
Z
Z
register stage is
n
1
1
Product specification
HEF4894B
O
O
O
O
O
nc
nc
10
10
10
10
OUTPUTS
S
SERIAL
’
’
’
’
O
O
O
nc
nc
nc
nc
S
11
11
’